Formal:
* Desejo-o/a: This is the most formal way to say "want you," and is usually used in writing or when addressing someone with a lot of respect.
* Quero-o/a: This is a slightly less formal version of "desejo-o/a."
Informal:
* Quero você: This is the most common way to say "want you" in informal situations.
* Te quero: This is a more affectionate way to say "want you," and is often used between friends, family members, or romantic partners.
Other Options:
* Preciso de você: This literally means "I need you," and can be used to express a strong desire for someone's presence.
* Estou a precisar de ti: This is another way to say "I need you," and is a more poetic and expressive way to express your longing.
Example sentences:
* Desejo-o em minha vida: I want you in my life (formal)
* Quero-a para sempre: I want you forever (formal)
* Quero você aqui comigo: I want you here with me (informal)
* Te quero muito: I love you very much (informal and affectionate)
Remember to use the correct pronoun (o/a for "you" singular masculine/feminine, or você/ti for "you" singular informal) depending on the context.